CH703570A2 - A method for mounting Verschleissvorrichtungen within a stop block a flame tube and stopper block. - Google Patents

Abstract

A stop block (40) with deployable wear devices (78) and methods for mounting the wear devices (78) within a stop block (40) are disclosed. The methods typically include enlarging a slot defined in the stop block (40) to form a cavity, fixing an insert set (62) in the cavity, and providing at least one wear device (78) connected to the insert set (62) is.

Description

Field of the invention

The present invention relates generally to attacks of a flame tube for gas turbine burners and more particularly to stop blocks of a flame tube with usable wear devices and related methods.

Background to the invention

Gas turbines normally include a compressor section, a combustion section and a turbine section. The compressor section pressurizes air flowing into the turbine. Compressed air discharged from the compressor section flows into the combustion section, which is typically characterized by a plurality of burners arranged annularly about the axis of the gas turbine. Each of these burners includes a flame tube defining the combustion chamber of the burner. Air flowing into the burner is mixed with fuel and burned in the flame tube. The hot combustion gases flow out of the fire tube through an interface to the turbine section of the gas turbine to drive the turbine and generate electricity.

The flame tube of a gas turbine combustor is usually arranged concentrically in a flow sleeve of the burner and spaced radially inwardly therefrom. The front end of the fire tube is typically provided with a plurality of circumferentially spaced stop tabs (ie, plug stops) which cooperate and / or connect to a corresponding number of stop blocks (ie, socket stops) on the flow sleeve or, in some embodiments , are attached to the combustion chamber housing. When the fire tube is mounted in the flow sleeve, the stops ensure proper radial and axial position of the fire tube in the flow sleeve and at the same time prevent the fire tube from moving in an axial downstream direction (i.e., in the direction of the interface).

Generally, the stops of the fire tube support the flame tube during the extreme vibration and heat generated by the combustion process within the burner. Often, combustion and thermal distortion caused by combustion cause the flame tube, flow sleeve, and other components of the burner to vibrate and change positions relative to each other. The flame tube usually vibrates and deforms thermally, in particular with respect to the flow sleeve. It is very often wear on the attacks of the flame tube found that are caused by such deformation and / or vibration. This can lead to a failure of the stop tab and / or the stop block, which can result in misalignment of the flame tube in the flow sleeve and / or damage to the flame tube or the flow sleeve.

To avoid such failures has been proposed that the entire stop block of a burner should be formed of a hardened alloy in order to reduce the wear occurring between the stop block and stop tab. However, in order to provide such a stop block in an existing burner, the existing stop block must be removed from the flow sleeve, which can bring several problems. In particular, the removal of the existing stop block requires a maintenance worker to drill the stop block out of the flow sleeve, which can be a very labor-intensive and tedious process. In addition, the removal of the original stop block eliminates all positioning means that were incorporated in the original design for aligning the stop block with the flow sleeve. The assembly of the new stop block is often more difficult and can lead to misalignment of the stop block to the flow sleeve. Moreover, both the existing and replacement stop blocks are often formed from relatively expensive alloys. A complete replacement of a stop block can lead to increased material costs.

Accordingly, a stop block of a flame tube with usable wear devices and a method for mounting such means within a stop block in the technology would welcome.

Brief description of the invention

The aspects and advantages of the invention will be set forth in part in the description which follows, and will be apparent from the description, or may be learned by practice of the invention.

In one aspect, the present invention discloses methods for mounting wear devices within a stop block of a fire tube. The methods may typically include enlarging a slot defined in the stop block to form a cavity, fixing an insert set in the cavity, and providing at least one wear device associated with the insert set.

In another aspect, the present invention discloses a stop block of a flame tube for a burner. The stop block may generally include an outer block defining a cavity and an insertion set in the cavity. The inserter set may determine a channel configured to receive a counterpart of the stopper block. In addition, the stop block may comprise at least one wear device connected to the insertion set.

In a further aspect, the present invention discloses a burner having a combustion chamber housing, a flow sleeve, and a flame tube disposed substantially concentrically within the flow sleeve. The burner may include at least one stop tab secured to the i) flow sleeve ii) the flame tube and iii) the combustor housing and at least one stop block secured to another i) flow sleeve ii) flame tube and iii) combustor housing. The stop block can usually be configured to engage the stop tab. The stop block may further comprise an outer block defining a cavity, an insertion set in the cavity, and at least one wear device connected to the insertion set.

These and other features, aspects, and advantages of the present invention will become better understood with reference to the following description and appended claims. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

Brief description of the drawings

The description includes a complete disclosure of the present invention, including the best mode, and is directed to those skilled in the art. It refers to the attached figures, in which:

FIG. Figure 1 is a cross-section of one embodiment of a gas turbine combustor;

FIG. Figure 2 is a perspective view of one embodiment of a stop block of a fire tube and a stop tab;

FIG. Figure 3 shows a flow chart with an embodiment of a method of assembling wear devices within a stop block in accordance with aspects of the present invention;

FIG. Figure 4 is a perspective view of embodiments of a stop block and an insert set that may be inserted into the stop block in accordance with the aspects of the present invention;

FIG. 5 is a perspective view of one embodiment of a stop block of a fire tube and the inserter of FIG. 4, particularly showing the insertion of the insert set defining an elongated channel and secured within the stop block in accordance with the aspects of the present invention;

FIG. Figure 6 is a perspective view of one embodiment of a wear device that may be employed in an embodiment of the inserter in accordance with aspects of the present invention; and

FIG. 7 is a perspective view of one embodiment of a mounted stop block, including deployable wear devices, in accordance with aspects of the present invention.

Detailed description of the invention

Reference will now be made in detail to embodiments of the invention, wherein one or more examples are shown in the drawings. Each example is attached to the explanation of the invention and not as a limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or basic principle of the invention. For example, features depicted or described as part of one embodiment may be combined with other embodiments to yield a further embodiment. Thus, it is intended that the present invention cover such modifications and variations as may come within the scope of the appended claims and their equivalents.

The present invention is generally directed to a stop block including usable wear devices and a method for mounting such wear devices within a stop block. For example, the disclosed stop block typically includes an insert set having one or more associated wear devices configured to reduce the wear between the stop block and the stop tab. By combining such wear devices with the disclosed inserter, it is no longer necessary to replace the original stopper block. In particular, a cavity may be formed within the original stop block that is configured to receive the insert set and the associated wear devices. Accordingly, the cost of removing the stopper block, such as labor and material costs, can be eliminated. In addition, by using the original stop block, the exact position of the stop block from the original mounting can be maintained. Further, the stop block of the present invention may be configured to have a standardized size and / or shape so that it can be used on a variety of different gas turbines with stop blocks of different sizes, shapes and / or configurations.

Referring to the drawings, FIG. FIG. 1 illustrates a cross-section of one embodiment of a gas turbine combustor 20. The combustor 20 may typically include a substantially cylindrical combustor housing 22 attached to a portion of a gas turbine housing 24, such as an exhaust housing of a compressor or a combustor housing. The burner 20 may also include an internal flow sleeve 26 and a flame tube 28 disposed substantially concentrically within the flow sleeve 26. Both the flow sleeve 26 and the flame tube 28 may extend at their downstream ends to a double-walled overflow channel, including an impact sleeve 30 and an intermediate piece 32 disposed within the impact sleeve 30. However, it should be noted that some gas turbines are single-walled Include overflow. In addition, the impact sleeve 30 and the flow sleeve 26 may be provided with a plurality of air supply holes 34 over a portion of their surfaces, whereby the compressed air from the compressor section of the gas turbine in the radial space between the flame tube 28 and flow sleeve 26 can flow.

The flame tube 28 of the burner 20 may typically define a substantially cylindrical combustion chamber 36 in which fuel and air are admitted and burned to produce hot combustion gases. The flame tube 28 may be coupled at its downstream end to the spacer 32 such that the flame tube 28 and the spacer 32 generally define a flow path for the hot combustion gases flowing from each burner 20 to the turbine section of a gas turbine engine.

The fire tube 28 may also include one or more male stop tabs 38 configured to cooperate with or engage one or more female stop blocks 40 attached to the flow sleeve 26 or, in some embodiments, to the combustor housing 22 , In particular, the stop tabs 38 may be adapted to be slid into a longitudinal slot 52 (FIG. 2) defined within the stop blocks 40 as well as the fire tube 28 mounted in the burner 20 so as to provide accurate circumferential alignment of the fire tube 28 to ensure in the flow sleeve 26. In addition, the stops 38, 40 can also be used to mark the proper installation depth of the flame tube 28, as well as to prevent a rotation and / or axial movement of the flame tube 28 during operation of the burner 20. It should be noted that in alternative embodiments, the stop tabs 38 may be disposed on the flow sleeve 26 or combustor housing 22 while the stop blocks 40 may be disposed on the fire tube 28.

Referring to FIG. Figure 2 shows the figure perspective views of embodiments of a stop tab 38 of a fire tube and a stop block 40 of a fire tube. In general, the stop block 40 may be secured to an inner surface 42 of the flow sleeve 26. However, in some embodiments, the stop block 40 may be secured to an interior surface of the combustor housing 22. In addition, the stop tab 38 can be fastened to an outer surface 44 of the flame tube 28. It should be noted that the stop block 40 and the stop tab 38 may be secured to the flow sleeve 26 and the flame tube 28 by any known, suitable means known in the art. For example, as shown in FIG. 2, the stop block 40 may be welded to an inner surface 42 of the flow sleeve 26. The stop block 40 may also include a nail, rod, or other mounting features (not shown) that extend through the flow sleeve 26 to facilitate another attachment mechanism between the stop block 40 and the flow sleeve 26. Thus, the stop tab 38 can be welded to an outer surface 44 of the flame tube 28. It should be noted, however, that in alternative embodiments, the stops 38, 40 may be secured to the respective burner components by any suitable attachment mechanism, such as by using screws, bolts, or other known mechanical fasteners.

In general, it should be noted that the stop block 40 and the stop tab 38 can be configured to have a suitable shape and / or configuration for allowing the stop tab 38 to connect and / or latch with the stop block 40 thus facilitating the assembly of the flame tube 28 and / or properly aligning the flame tube 28 within the flow sleeve 26 (or combustion chamber housing 22) and / or preventing rotation and / or axial movement of the flame tube 28 during operation of the burner 20. For example, the embodiment in FIG. 2, how the stop block 40 includes a substantially planar or flat end 46, a rounded or curved end 48, and a pair of sidewalls 50 extending between the flat end 46 and the curved end 48. The stop block 40 may also define a longitudinal slot 52 configured to receive the stop tab 38. The longitudinal slot 52 may typically be defined from the flat end 46 of the stop block 40 and may extend toward the curved end 48. As shown in FIG. As shown in Figure 2, the stop tab 38 may typically include a base 54 and a substantially rectangular projection 56 extending from the base 54 so that the stop tab 38 can slide and snap into the stop block 40, as well as the fire tube 28 in the Flow sleeve 26 is mounted. It should be noted that although a single set of stops 38, 40 in FIG. 2, two, three or more sets of stops 38, 40 may be included within each burner 20.

As already mentioned above, the present invention generally aims at a stop block including usable wear devices and a method for mounting such wear devices within a stop block from. Therefore, a general embodiment of the disclosed method will be described with reference to FIG. 3 and described in detail with reference to FIG. 4-7 explained. In addition, various embodiments of the disclosed stop block will be described with reference to FIG. 4-7 described.

Referring to FIG. Fig. 3 illustrates an embodiment of a method for mounting the wear devices within a stop block. The method may typically include enlarging a slot defined in the stop block to form a cavity 302, fixing an insert set in the cavity 304, and providing at least one wear device connected to the insert set 306. As indicated above, the disclosed method typically allows the wear devices to be mounted within a stop block without replacement of the existing stop block. The method is generally described herein with reference to the mounting of the wear devices in new and used stop blocks that were not originally designed to include such devices. It should be noted, however, that the disclosed method can also be used to quickly and efficiently mount new wear devices in abutment blocks that already included one or more wear devices. It should also be noted that although the various elements 302, 304, 306 of the disclosed method are arranged in a particular order in FIG. 3, the elements may typically be implemented in any order consistent with the disclosure.

Referring to FIG. 4, the illustration shows perspective views of embodiments of a stop block 40 attached to a portion of a flow sleeve 26 of a burner 20 (FIG. 1). In particular, FIG. 4 embodiments of the stop block 40 before and after it has been enlarged to define a cavity 60 in accordance with the aspects of the present invention. Thus, the stop block 40 may be initially defined as a longitudinal slot 52 which, as mentioned above, is configured to receive a corresponding stop tab 38 (FIG. 2). However, as FIG. 4, an expanded cavity 60 may be formed within the stop block 40 by processing or otherwise removing material from the stop block 40 in the region adjacent the longitudinal slot 52. Accordingly, in one embodiment, the cavity 60 may define a larger volume than the volume defined by the longitudinal slot 52. Typically, the cavity 60 may be formed in the stop block 40 so that an insert set 62 may be inserted into the cavity 60 or otherwise disposed. The stop block 40 may typically function as an outer block 64 to receive the inserter 62. It should be noted that the cavity 60 may be formed by any suitable known means of the art. For example, various known machining methods such as milling, drilling, and other precision machining processes may be used to form the cavity 60 within the abutment block 40.

Typically, the inserter set 62 and the cavity 60 may be configured in any suitable shape and / or configuration that allows the components to function as described herein. For example, in one embodiment, the insertion set 62 may be configured substantially similar to the stop block 40. In the illustrated embodiment, the inserter set 62 may include a substantially planar or flat end 66, a rounded or curved end 68, and a pair of sidewalls 70 extending between the flat end 66 and the curved end 68. As shown in FIG. 4, the cavity 60 may define a corresponding shape so that the inserter set 62 may be received therein. In alternative embodiments, it should be noted that the insert set 62 and corresponding cavity 60 may be substantially rectangular in shape or may define any other suitable shapes and / or cross sections. It should also be noted that the inserter 62 can typically be formed of any suitable material. The inserter set 62 may in one particular embodiment be formed of a relatively inexpensive metal, such as steel.

Still referring to FIG. 4, the inserter set 62 may also be configured to be secured within the cavity 60 by any suitable known means of the art. For example, in one embodiment, the inserter set 62 may be configured to be welded to the stopper block 40. In such an embodiment, the inserter set 62 may define one or more weld preparation apparatus (s) configured to assist in welding the inserter set 62 to the stopper block 40. For example, as illustrated, the inserter set 62 may define a beveled or chamfered edge 72 along portions of its outer periphery. Other suitable weld preparation apparatus may include grooves, grooves, notches, and the like. In alternative embodiments, the inserter set 62 may be configured to be secured within the cavity 60 with mechanical fasteners, e.g. B. by use of bolts or screws, or with any other suitable fastening mechanism and / or known methods of the art can be attached. In addition, it should be noted that if the insert set 62 is in the stop block; 40, it is not necessary to configure it as a blank (eg a solid block of material) as shown in FIG. 4 is shown. For example, in alternative embodiments, the insertion set 62 may include machined features such as a channel 74 and / or a recessed area 76 with reference to FIGS. 5 and 6 and / or one or more wear device (s) before it is inserted into the stop block 40.

Referring to FIG. 5, the illustration shows a perspective view of one embodiment of the insert set 62 mounted in the cavity 60 of the stop block 40. In particular, the insert set 62 is shown welded to the stop block 40 along the chamfered edge 72 defined at the interface of the insert set 62 and the stop block 40 , As FIG. 5, a channel 74 may be formed within the insert set 62 so that the stop tab 38 (FIG. 2) of the fire tube 28 may be received within the channel 74 as the fire tube 28 is mounted within the flow sleeve 26. In general, it should be noted that the channel 74 may be formed in the insert set 62 and thus define any suitable shape and / or cross section. In a particular embodiment of the present invention, the channel 74 may define the same size, shape, and / or dimension as the longitudinal slot 52 defined in the stop block 40 (FIG.

It should be noted that the channel 74 may be formed by any suitable means. For example, various known machining methods such as milling, drilling, and other precision machining processes may be used to form the channel 74 within the insert set 62. In addition, as noted above, the channel 74 may be formed prior to or subsequent to insertion and / or attachment of the insert set 62 in the stop block 40. For example, the inserter set 62 may be preprocessed or otherwise formed (eg, by a molding process) so that the channel 74 in the inserter set 62 is defined prior to insertion of the inserter set 62 into the stopper block 40.

Referring to FIG. Figure 6 is a perspective view of one embodiment of a wear device that may be included in an inserter 62 in accordance with aspects of the present invention. The wear device includes a wear washer or belt 78 that is generally configured to reduce the wear experienced between stop block 40 and stop tab 38. In particular, the wear band 78 may be formed of any wear resistant material suitable for preventing or reducing wear between the stop block 40 and the stop tab 38. For example, suitable materials used for the wear band 78 may include cobalt base alloys such as FSX-14 and L-605, nickel-base alloys, and other hard-wearing / armored materials.

In an alternative embodiment, it should be noted that the wear device of the present invention comprises a wear resistant coating formed on the surface of the channel 74 defined in the insert set 62 by any suitable method, such as welding, metal spraying, thermal spraying, diffusion methods, and the like can be applied. Suitable wear-resistant coatings include, but are not limited to, coatings with one or more of the following materials: chromium carbide, tungsten, cobalt, STELLITE 6 alloy, any suitable durable / armored material, and / or other materials that are suitable for the channel 74, increase the wear resistance of the inserter 62. In another embodiment, the entire insert set 62 may be formed of a wear resistant material. In such an embodiment, the inserter set 62 may serve as a wear device of the present invention. Suitable wear resistant materials include cobalt base alloys such as FSX-14 and L-605, nickel base alloys, and other hardwearing / armored materials.

Still referring to FIG. 6, in embodiments where the wear device consists of a wear band 78, the wear band 78 may typically have any suitable shape and / or configuration that allows the band 78 to be inserted into the insertion set 62 or otherwise Way within the insertion set 62 to be arranged. The wear band 78 may also be configured to define an elongated opening 80. For example, in one embodiment, the opening 80 may be similarly shaped, coated, and / or similarly dimensioned and / or similar to the longitudinal slot 52 defined in the stop block 40 (FIG. 4), much like the channel 74 defined in the insert set 62. It should be noted that the opening 80 may be adjusted to snap with the stop tab 38 or otherwise receive the stop tab 38 (FIG. 2) of the fire tube 28 as the fire tube 28 is mounted within the flow sleeve 26. Accordingly, the wear band 78 can usually act as an interface between the insertion set 62 and the stop tab 38 and thus can the wear occurring between the stop block; 40 and stop tab 38 during operation of the burner 20 reduce.

Additionally, in one embodiment, a recessed area 76 may be defined within the channel 74 of the inserter set 62 and configured to receive the wearstrip 78. As shown in FIG. 6-6, a recessed area 76 may be formed within the inserter set 62 by machining or otherwise removing material from the inserter set 62 such that at least a portion of the channel 74 is enlarged or otherwise widened. In one embodiment, the recessed area 76 may generally have the same shape, size, and / or dimensions of the wear band 78. For example, as shown in FIG. 7, the recessed portion 76 may be configured such that when the wear band 78 is inserted into the insert set 62, the wear band 78 is positioned substantially flush with the portion of the channel 74 that is not enlarged or otherwise formed by the recess portion 76 is extended. It should be noted that the recessed area 76 may be formed by any suitable means. For example, various known machining methods such as milling, drilling, and other precision machining processes may be used to form the recessed area 76 within the insert set 62. It should also be noted that in alternative embodiments, a pit area 76 need not be defined within the insert set 62. For example, the channel 74 may be formed within the insert set 62 so as to define appropriate dimensions for receiving the wear band 78.

Referring to FIG. Figure 7 is a perspective view of one embodiment of a mounted stop block 40, including deployable wear devices, in accordance with aspects of the present invention. As shown, the abutment block 40 typically includes an outer block 64, an insert set 62, and a wear band 78, which may typically be configured as described above. Thus, the outer block 64 may be configured to be attached to a portion of the flow sleeve 26 or, as is possible, to the combustor housing 22 of the combustor 20 (FIG. In addition, the outer block 64 may typically define a cavity 60 (FIG. 4) to receive the inserter 62. As shown, the insertion set 62 may generally include a recessed area 76 (FIG. 6) in a channel 74 for receiving the wear band 78. Further, the wear band 78 may be configured to fit within the recessed area 76 and define an elongate opening 80 configured to receive the stop tab 38 (FIG. 2) of the flame tube 28. Accordingly, the wear band 78 may act as an interface between the stop block 40 and the stop tab 38, and thus may reduce the wear between the components.

This written description makes use of examples of the invention, including the best mode of operation, to enable as much as possible to all those skilled in the art, including the manufacture and use of all apparatus or systems and all integrated methods. The patentable scope of the invention is determined by the claims and may include other examples that occur to those skilled in the art. It is intended that these other examples be within the scope of the claims if they include structural elements that do not differ from the wording of the claims, or if they include equivalent structural elements with insubstantial differences from the terms of the claims.

A stop block 40 with deployable wear devices 78 and methods for mounting the wear devices 78 within a stop block 40 are disclosed. The methods may typically include enlarging a slot defined in the stop block 40 to form a cavity 60, fixing an insert set 62 in the cavity 60, and providing at least one wear device 78 connected to the insert set 62.

LIST OF REFERENCE NUMBERS

[0041] <Tb> 20 <sep> gas turbine burner <Tb> 22 <sep> burner housing <Tb> 24 <sep> Gas turbine housing <tb> 26 <sep> Internal flow sleeve <Tb> 28 <sep> flame tube <Tb> 30 <sep> Auftreffhülse <Tb> 32 <sep> adapter <Tb> 34 <sep> air holes <Tb> 36 <sep> combustion chamber <tb> 38 <sep> Male Stop Tabs (Plug) <tb> 40 <sep> Female stopper blocks (female) <tb> 42 <sep> Inner surface (sleeve 26) <tb> 44 <sep> Outer surface (of the fire tube 28) <tb> 46 <sep> Flat end <tb> 48 <sep> Curved end <Tb> 50 <sep> side walls <Tb> 52 <sep> longitudinal slot <Tb> 54 <sep> base <Tb> 56 <sep> Lead <tb> 60 <sep> Enlarged cavity <tb> 62 <sep> Insertion (IB) <tb> 64 <sep> Outer block <tb> 66 <sep> Flat end of the IB <tb> 68 <sep> Rounded or curved end of IB <tb> 70 <sep> Sidewalls of the IB <tb> 72 <sep> Beveled edge <Tb> 74 <sep> Channel <Tb> 76 <sep> depression region <Tb> 78 <sep> Verschleissband <Tb> 80 <sep> Opening <Tb> 302 <sep> stop block <Tb> 304 <sep> cavity <Tb> 306 <sep> Insert block

Claims (15)

A method of assembling wear devices (78) within a stop block (40) defining a slot (52) configured to receive a stop tab (38), the method comprising: Expanding the slot (52) defined in the stop block (40) to form a cavity (60); to fix an insertion set (62) in the cavity (60); and to provide at least one wear device (78) associated with the inserter (62). The method of claim 1, further comprising forming a channel (74) in the inserter (62) before or after the inserter (62) is positioned in the cavity (60). The method of claim 2, wherein the channel (74) has substantially the same dimensions as the slot (52) defined in the stop block (40) so that the stop tab (38) can be received within the channel (74). The method of claim 2, further comprising inserting the at least one wear device (78) into the channel (74) before or after the insert set (62) is fixed in the cavity (60). The method of claim 2, further comprising changing the channel (74) to form a pit area (76) in the inserter set (62). 6. The method of claim 5, wherein the at least one wear device (78) is disposed in the recessed area (76). The method of claim 1, wherein the at least one wear device (78) consists of a wear band (78) and the wear band (78) is formed of wear resistant material. 8. The method of claim 7, wherein the wear band (78) is disposed within the insert set (52) so that the stop tab (38) contacts the wear band (78) when the stop tab (38) is received in the stop block (40). The method of claim 1, wherein the at least one wear device (78) comprises a wear-resistant coating that is applied to the inserter (62). 10. The method according to any one of the preceding claims, further comprising the attachment of the insert kit (62) on the stop block (40). The method of claim 10, wherein attaching the inserter set (62) to the stopper block (40) comprises welding the inserter set (62) to the stopper block (40), the inserter set (62) carrying at least one weld seam preparation device (72) Interface of the insert block (62) and the stop block (40) defined. 12. stop block (40) for a burner (20), wherein the stop block (40) comprises: an outer block (64) defining a cavity (60); an inserter set (62) disposed in the cavity (60), the inserter set (62) defining a channel (74) configured to receive a mating component of the stopper block (40); and at least one wear device (78) associated with the inserter (62). The stop block (40) of claim 12, wherein the at least one wear device (78) comprises a wear band (78), the wear band (78) being formed of wear resistant material. 14. stop block (40) according to claim 13, wherein the insertion set (62) defines a recessed area (76) in the channel (74) and the Verschleissband (78) in the recessed area (76) is arranged. The stop block (40) of claim 12, wherein the at least one wear device (78) has a wear-resistant coating applied to the channel (74).